When this animal was young, Shakespeare was writing his greatest plays and the English were establishing their first settlements in the Americas.

The team plucked the mollusk from 262-feet-deep (80-meter-deep) waters off the northern coast of Iceland.

The team is studying growth lines in clam shells as part of a project to understand how the climate has changed over the past thousand years.

"On a side note, we discovered this very old clam," said Al Wanamaker, a postdoctoral researcher at the university.

Some protest the "oldest animal" designation, saying it should go to certain corals that grow together to form colonies. By this reckoning, the clam would be only the oldest non-colonial animals.

Slow Aging

Quahog clams are known for their longevity.

A 220-year-old taken from American waters in 1982 holds the official Guinness Book of World Records oldest animal title. Unofficially, the record belongs to a 374-year-old Icelandic clam housed in a German museum.

The new clam is at least 30 years older, according to the Bangor University team. The animal died when the researchers counted its rings.

"There's probably many others that are actually quite older—we just haven't found them yet," Wanamaker said.

"I think in my stomach if you start getting up around 600, then maybe that would be the maximum—but that's just pure speculation," he added.

Scientists believe the secret to the clams' longevity is a slowed cell-replacement process. But why they age so slowly is unknown.

"It is possible that an investigation of the tissues of these real-life Methuselahs might help us to understand the process of aging," team member Chris Richardson said in a media statement.

Wanamaker added that several research teams want to study the tissue of living quahog clams to tease out the secret.